This is a QR code. A QR Code is a 2-dimensional barcode, which has encoded in it a URL (web address), text, or other information. It can be read by a QR code scanner, including QR scanner smartphone apps. Once you have an app installed on your smartphone, open the app and hold your phones camera over a QR code to read it. Most QR codes youll come across have a URL encoded, so chances are when you read the QR code it will take you to a web page.
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This site is based on chapter 1 in a document called Introduction to Cryptography, which is included in the documentation for PGP software (see technical remarks below). The site provides information, with diagrams, on how encryption and decryption work. It explains various forms of cryptography including public key cryptography which is used in the PGP software.
The site also discusses other security features useful in electronic commerce, including digital signatures and digital certificates. This latter material is relatively detailed and may not be of interest to a student who is more interested in cryptography than e-commerce.
PGP (pretty good privacy) is encryption software for securing e-mail communications. It is available in a free, public domain version for personal use as well as in a commercial version.